buff vs metalhead

buff and metalhead both are nouns.

Word	Noun	Adjective	Verb	Adverb
buff	Yes	Yes	Yes	No
metalhead	Yes	No	No	No

As nouns, metalhead is a hyponym of buff; that is, metalhead is a word with a more specific, narrower meaning than buff:

buff (noun)	metalhead (noun)
an implement consisting of soft material mounted on a block; used for polishing (as in manicuring)	a fan of heavy metal music
a medium to dark tan color
bare skin
an ardent follower and admirer
a soft thick undyed leather from the skins of e.g. buffalo or oxen

buff (adjective)	metalhead (adjective)
of the yellowish-beige color of buff leather

buff (verb)	metalhead (verb)
polish and make shiny
strike, beat repeatedly